timing.h

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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef SP_TIMING_H
#define SP_TIMING_H
namespace sp
{

template <class T1> class Delay
{
private:
  arma::uword D;     
  arma::uword cur_p; 
  arma::Col<T1> buf; 
public:
  Delay()
  {
    cur_p = 0;
    D     = 0;
  }

  Delay(const arma::uword _D)
  {
    set_delay(_D);
    clear();
  }

  ~Delay() {}

  void clear(void)
  {
    buf.zeros();
    cur_p = 0;
  }

  void set_delay(const arma::uword _D)
  {
    D = _D + 1;
    buf.set_size(D);
  }

  T1 operator()(const T1 &in)
  {
    buf[cur_p] = in; // Insert new sample
    // Move insertion point
    if (cur_p == 0)
      cur_p = D - 1;
    else
      cur_p--;

    return buf[cur_p];
  }

  arma::Col<T1> delay(const arma::Col<T1> &in)
  {
    arma::uword sz = in.size();
    arma::Col<T1> out(sz);
    for (arma::uword n = 0; n < sz; n++)
      out[n] = this->operator()(in[n]);
    return out;
  }
};

} // namespace sp
#endif